From patchwork Fri Jun 16 08:50:29 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mike Rapoport X-Patchwork-Id: 13282222 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id DC7F6DF46; Fri, 16 Jun 2023 08:51:28 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id EC877C433CB; Fri, 16 Jun 2023 08:51:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1686905488; bh=pb8Z4rxsM0yBpjwRPF1Qed87z579BhooyvNuy+PUQCk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=SB9uDtnNDYLKu1T9LikI8QGyk91Nzx06vgv8rwiPKboDZQZmMqOcn4UlzXtreruPk IFyNG1tHP4kqpcaojMY+WwqBpBgvZGKC2GFF4PAuO8fCCtOpIBo8PmzqHTi6KbgK73 E8Zs5OUs9eJKG/mrr0WWwxV2H7qcoVS31HbeyRMeQ7JIBRFRq4sIfCxe6b+CJGqeeA +DtpOa5d/+cFTbC2ej+fiqSk/7GwiTNLf9BfBPjq+UV2jHQFYxRB/vqvw3HdLEoU+m G/NhfI9yw9teIhVrb5dhTW3mSsQkx23Z8EHPvRYbvDQWf45wIQgURVj/iTJfL126kd 6MoFwW06K+J9Q== From: Mike Rapoport To: linux-kernel@vger.kernel.org Cc: Andrew Morton , Catalin Marinas , Christophe Leroy , "David S. Miller" , Dinh Nguyen , Heiko Carstens , Helge Deller , Huacai Chen , Kent Overstreet , Luis Chamberlain , Mark Rutland , Michael Ellerman , Mike Rapoport , Nadav Amit , "Naveen N. Rao" , Palmer Dabbelt , Puranjay Mohan , Rick Edgecombe , Russell King , Song Liu , Steven Rostedt , Thomas Bogendoerfer , Thomas Gleixner , Will Deacon , bpf@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mips@vger.kernel.org, linux-mm@kvack.org, linux-modules@vger.kernel.org, linux-parisc@vger.kernel.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, loongarch@lists.linux.dev, netdev@vger.kernel.org, sparclinux@vger.kernel.org, x86@kernel.org Subject: [PATCH v2 03/12] mm/execmem, arch: convert simple overrides of module_alloc to execmem Date: Fri, 16 Jun 2023 11:50:29 +0300 Message-Id: <20230616085038.4121892-4-rppt@kernel.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20230616085038.4121892-1-rppt@kernel.org> References: <20230616085038.4121892-1-rppt@kernel.org> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: "Mike Rapoport (IBM)" Several architectures override module_alloc() only to define address range for code allocations different than VMALLOC address space. Provide a generic implementation in execmem that uses the parameters for address space ranges, required alignment and page protections provided by architectures. The architecures must fill execmem_params structure and implement execmem_arch_params() that returns a pointer to that structure. This way the execmem initialization won't be called from every architecure, but rather from a central place, namely initialization of the core memory management. The execmem provides execmem_text_alloc() API that wraps __vmalloc_node_range() with the parameters defined by the architecures. If an architeture does not implement execmem_arch_params(), execmem_text_alloc() will fall back to module_alloc(). The name execmem_text_alloc() emphasizes that the allocated memory is for executable code, the allocations of the associated data, like data sections of a module will use execmem_data_alloc() interface that will be added later. Signed-off-by: Mike Rapoport (IBM) Acked-by: Song Liu --- arch/loongarch/kernel/module.c | 18 ++++++++++-- arch/mips/kernel/module.c | 18 +++++++++--- arch/nios2/kernel/module.c | 19 +++++++++---- arch/parisc/kernel/module.c | 23 +++++++++------ arch/riscv/kernel/module.c | 20 +++++++++---- arch/sparc/kernel/module.c | 44 +++++++++++++--------------- include/linux/execmem.h | 52 ++++++++++++++++++++++++++++++++++ mm/execmem.c | 52 +++++++++++++++++++++++++++++++--- mm/mm_init.c | 2 ++ 9 files changed, 195 insertions(+), 53 deletions(-) diff --git a/arch/loongarch/kernel/module.c b/arch/loongarch/kernel/module.c index b8b86088b2dd..32b167722c2b 100644 --- a/arch/loongarch/kernel/module.c +++ b/arch/loongarch/kernel/module.c @@ -18,6 +18,7 @@ #include #include #include +#include #include #include @@ -469,10 +470,21 @@ int apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab, return 0; } -void *module_alloc(unsigned long size) +static struct execmem_params execmem_params = { + .modules = { + .text = { + .pgprot = PAGE_KERNEL, + .alignment = 1, + }, + }, +}; + +struct execmem_params __init *execmem_arch_params(void) { - return __vmalloc_node_range(size, 1, MODULES_VADDR, MODULES_END, - GFP_KERNEL, PAGE_KERNEL, 0, NUMA_NO_NODE, __builtin_return_address(0)); + execmem_params.modules.text.start = MODULES_VADDR; + execmem_params.modules.text.end = MODULES_END; + + return &execmem_params; } static void module_init_ftrace_plt(const Elf_Ehdr *hdr, diff --git a/arch/mips/kernel/module.c b/arch/mips/kernel/module.c index 0c936cbf20c5..2d370de67383 100644 --- a/arch/mips/kernel/module.c +++ b/arch/mips/kernel/module.c @@ -20,6 +20,7 @@ #include #include #include +#include extern void jump_label_apply_nops(struct module *mod); @@ -33,11 +34,20 @@ static LIST_HEAD(dbe_list); static DEFINE_SPINLOCK(dbe_lock); #ifdef MODULE_START -void *module_alloc(unsigned long size) +static struct execmem_params execmem_params = { + .modules = { + .text = { + .start = MODULES_VADDR, + .end = MODULES_END, + .pgprot = PAGE_KERNEL, + .alignment = 1, + }, + }, +}; + +struct execmem_params __init *execmem_arch_params(void) { - return __vmalloc_node_range(size, 1, MODULE_START, MODULE_END, - GFP_KERNEL, PAGE_KERNEL, 0, NUMA_NO_NODE, - __builtin_return_address(0)); + return &execmem_params; } #endif diff --git a/arch/nios2/kernel/module.c b/arch/nios2/kernel/module.c index 9c97b7513853..3cf5723e3c70 100644 --- a/arch/nios2/kernel/module.c +++ b/arch/nios2/kernel/module.c @@ -18,15 +18,24 @@ #include #include #include +#include #include -void *module_alloc(unsigned long size) +static struct execmem_params execmem_params = { + .modules = { + .text = { + .start = MODULES_VADDR, + .end = MODULES_END, + .pgprot = PAGE_KERNEL_EXEC, + .alignment = 1, + }, + }, +}; + +struct execmem_params __init *execmem_arch_params(void) { - return __vmalloc_node_range(size, 1, MODULES_VADDR, MODULES_END, - GFP_KERNEL, PAGE_KERNEL_EXEC, - VM_FLUSH_RESET_PERMS, NUMA_NO_NODE, - __builtin_return_address(0)); + return &execmem_params; } int apply_relocate_add(Elf32_Shdr *sechdrs, const char *strtab, diff --git a/arch/parisc/kernel/module.c b/arch/parisc/kernel/module.c index f6e38c4d3904..569b8f52a24b 100644 --- a/arch/parisc/kernel/module.c +++ b/arch/parisc/kernel/module.c @@ -49,6 +49,7 @@ #include #include #include +#include #include #include @@ -173,15 +174,21 @@ static inline int reassemble_22(int as22) ((as22 & 0x0003ff) << 3)); } -void *module_alloc(unsigned long size) +static struct execmem_params execmem_params = { + .modules = { + .text = { + .pgprot = PAGE_KERNEL_RWX, + .alignment = 1, + }, + }, +}; + +struct execmem_params __init *execmem_arch_params(void) { - /* using RWX means less protection for modules, but it's - * easier than trying to map the text, data, init_text and - * init_data correctly */ - return __vmalloc_node_range(size, 1, VMALLOC_START, VMALLOC_END, - GFP_KERNEL, - PAGE_KERNEL_RWX, 0, NUMA_NO_NODE, - __builtin_return_address(0)); + execmem_params.modules.text.start = VMALLOC_START; + execmem_params.modules.text.end = VMALLOC_END; + + return &execmem_params; } #ifndef CONFIG_64BIT diff --git a/arch/riscv/kernel/module.c b/arch/riscv/kernel/module.c index 7c651d55fcbd..ee5e04cd3f21 100644 --- a/arch/riscv/kernel/module.c +++ b/arch/riscv/kernel/module.c @@ -11,6 +11,7 @@ #include #include #include +#include #include #include @@ -436,12 +437,21 @@ int apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab, } #if defined(CONFIG_MMU) && defined(CONFIG_64BIT) -void *module_alloc(unsigned long size) +static struct execmem_params execmem_params = { + .modules = { + .text = { + .pgprot = PAGE_KERNEL, + .alignment = 1, + }, + }, +}; + +struct execmem_params __init *execmem_arch_params(void) { - return __vmalloc_node_range(size, 1, MODULES_VADDR, - MODULES_END, GFP_KERNEL, - PAGE_KERNEL, 0, NUMA_NO_NODE, - __builtin_return_address(0)); + execmem_params.modules.text.start = MODULES_VADDR; + execmem_params.modules.text.end = MODULES_END; + + return &execmem_params; } #endif diff --git a/arch/sparc/kernel/module.c b/arch/sparc/kernel/module.c index 66c45a2764bc..ab75e3e69834 100644 --- a/arch/sparc/kernel/module.c +++ b/arch/sparc/kernel/module.c @@ -14,6 +14,10 @@ #include #include #include +#include +#ifdef CONFIG_SPARC64 +#include +#endif #include #include @@ -21,34 +25,26 @@ #include "entry.h" +static struct execmem_params execmem_params = { + .modules = { + .text = { #ifdef CONFIG_SPARC64 - -#include - -static void *module_map(unsigned long size) -{ - if (PAGE_ALIGN(size) > MODULES_LEN) - return NULL; - return __vmalloc_node_range(size, 1, MODULES_VADDR, MODULES_END, - GFP_KERNEL, PAGE_KERNEL, 0, NUMA_NO_NODE, - __builtin_return_address(0)); -} + .start = MODULES_VADDR, + .end = MODULES_END, #else -static void *module_map(unsigned long size) -{ - return vmalloc(size); -} -#endif /* CONFIG_SPARC64 */ - -void *module_alloc(unsigned long size) + .start = VMALLOC_START, + .end = VMALLOC_END, +#endif + .alignment = 1, + }, + }, +}; + +struct execmem_params __init *execmem_arch_params(void) { - void *ret; - - ret = module_map(size); - if (ret) - memset(ret, 0, size); + execmem_params.modules.text.pgprot = PAGE_KERNEL; - return ret; + return &execmem_params; } /* Make generic code ignore STT_REGISTER dummy undefined symbols. */ diff --git a/include/linux/execmem.h b/include/linux/execmem.h index 0d4e5a6985f8..75946f23731e 100644 --- a/include/linux/execmem.h +++ b/include/linux/execmem.h @@ -4,6 +4,52 @@ #include +/** + * struct execmem_range - definition of a memory range suitable for code and + * related data allocations + * @start: address space start + * @end: address space end (inclusive) + * @pgprot: permisssions for memory in this address space + * @alignment: alignment required for text allocations + */ +struct execmem_range { + unsigned long start; + unsigned long end; + pgprot_t pgprot; + unsigned int alignment; +}; + +/** + * struct execmem_modules_range - architecure parameters for modules address + * space + * @text: address range for text allocations + */ +struct execmem_modules_range { + struct execmem_range text; +}; + +/** + * struct execmem_params - architecure parameters for code allocations + * @modules: parameters for modules address space + */ +struct execmem_params { + struct execmem_modules_range modules; +}; + +/** + * execmem_arch_params - supply parameters for allocations of executable memory + * + * A hook for architecures to define parameters for allocations of + * executable memory described by struct execmem_params + * + * For architectures that do not implement this method a default set of + * parameters will be used + * + * Return: a structure defining architecture parameters and restrictions + * for allocations of executable memory + */ +struct execmem_params *execmem_arch_params(void); + /** * execmem_text_alloc - allocate executable memory * @size: how many bytes of memory are required @@ -49,4 +95,10 @@ void *jit_text_alloc(size_t size); */ void jit_free(void *ptr); +#ifdef CONFIG_EXECMEM +void execmem_init(void); +#else +static inline void execmem_init(void) {} +#endif + #endif /* _LINUX_EXECMEM_ALLOC_H */ diff --git a/mm/execmem.c b/mm/execmem.c index eac26234eb38..c92878cf4d1a 100644 --- a/mm/execmem.c +++ b/mm/execmem.c @@ -5,14 +5,27 @@ #include #include -static void *execmem_alloc(size_t size) +struct execmem_params execmem_params; + +static void *execmem_alloc(size_t size, unsigned long start, unsigned long end, + unsigned int align, pgprot_t pgprot) { - return module_alloc(size); + return __vmalloc_node_range(size, align, start, end, + GFP_KERNEL, pgprot, VM_FLUSH_RESET_PERMS, + NUMA_NO_NODE, __builtin_return_address(0)); } void *execmem_text_alloc(size_t size) { - return execmem_alloc(size); + unsigned long start = execmem_params.modules.text.start; + unsigned long end = execmem_params.modules.text.end; + pgprot_t pgprot = execmem_params.modules.text.pgprot; + unsigned int align = execmem_params.modules.text.alignment; + + if (!execmem_params.modules.text.start) + return module_alloc(size); + + return execmem_alloc(size, start, end, align, pgprot); } void execmem_free(void *ptr) @@ -27,10 +40,41 @@ void execmem_free(void *ptr) void *jit_text_alloc(size_t size) { - return execmem_alloc(size); + return execmem_text_alloc(size); } void jit_free(void *ptr) { execmem_free(ptr); } + +struct execmem_params * __weak execmem_arch_params(void) +{ + return NULL; +} + +static bool execmem_validate_params(struct execmem_params *p) +{ + struct execmem_modules_range *m = &p->modules; + struct execmem_range *t = &m->text; + + if (!t->alignment || !t->start || !t->end || !pgprot_val(t->pgprot)) { + pr_crit("Invalid parameters for execmem allocator, module loading will fail"); + return false; + } + + return true; +} + +void __init execmem_init(void) +{ + struct execmem_params *p = execmem_arch_params(); + + if (!p) + return; + + if (!execmem_validate_params(p)) + return; + + execmem_params = *p; +} diff --git a/mm/mm_init.c b/mm/mm_init.c index 7f7f9c677854..3b11450efe8a 100644 --- a/mm/mm_init.c +++ b/mm/mm_init.c @@ -26,6 +26,7 @@ #include #include #include +#include #include "internal.h" #include "slab.h" #include "shuffle.h" @@ -2747,4 +2748,5 @@ void __init mm_core_init(void) pti_init(); kmsan_init_runtime(); mm_cache_init(); + execmem_init(); }